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Critical Height Sampling for Stand Volume Estimation

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Critical height sampling as a technique for estimating stand volume without using volume tables is explained. Based on point sampling for tree selection, the stand volume estimator is the product of the point sampling basal area factor and the sum of critical heights of trees in the sample. The critical height of a tree is the height to a point on the bole where stem diameter exactly subtends the horizontal sighting angle from a vertical line originating at the sample point. The estimator is shown to be unbiased when either of two published tree taper models is assumed. Variances of the ongrowth and nongrowth components of the volume growth estimator are shown to be less than the variances of these components in the compatible estimator for growth when a random spatial distribution of trees is assumed. Forest Sci. 31:899-911.
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Keywords: Tree taper functions; continuous forest inventory; point sampling; volume growth

Document Type: Journal Article

Affiliations: Professor of Forest Biometrics, School of Forest Resources, University of Georgia, Athens, GA 30602

Publication date: 1985-12-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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